A new release of ganglia-nagios-bridge is now available. The package has also been uploaded to Debian for those who use that and it will appear in backports soon. The main improvement in this version is slightly better support for generating an UNKNOWN alert in Nagios when fresh metrics fail to appear in Ganglia.
There is also a new wiki comparing the various Ganglia and Nagios integration solutions.
The latest JMXetric and gmetric4j releases improve support for JBoss, specifically, working around some issues that occur when a profiling agent accesses the logger or MBean platform during JVM startup.
The page about JBoss, Wildfly and Tomcat integration details for Ganglia/JMXetric performance monitoring has also been updated to cover these improvements.
The process of having JMXetric and gmetric4j packaged is now under way and it has been verified that they just work with the tomcat7 packages on Debian and Ubuntu (config sample included).